宾语从句和定语从句最主要是在定语从句中也可以用that宾语从句也可以.when and where 都可以.比如这个例子：It was at 5 o'clock when you should do your homework 为什么这里用when而不用that!为了让各位更

宾语从句和定语从句最主要是在定语从句中也可以用that宾语从句也可以.when and where 都可以.比如这个例子：It was at 5 o'clock when you should do your homework 为什么这里用when而不用that!为了让各位更
宾语从句和定语从句
最主要是在定语从句中也可以用that宾语从句也可以.when and where 都可以.比如这个例子：It was at 5 o'clock when you should do your homework 为什么这里用when而不用that!
为了让各位更好的解答,我在总结一下以上的问题：
1：请解释下在什么情况下用定语和宾语从句（最好贴上一两个例子是对比的）和当that 用于定语和宾语从句的情况下不同的区别
2：再呢是解答我上述所说的问题.
3：当修饰一个地点的从句里,用where还是用that
--最主要还是第一个问题.
It was 5 o'clock when you should do your homework .如果去掉at 的话，那还是选when还是that呢？

宾语从句和定语从句最主要是在定语从句中也可以用that宾语从句也可以.when and where 都可以.比如这个例子：It was at 5 o'clock when you should do your homework 为什么这里用when而不用that!为了让各位更
（1）句子的组成部分,包括主语、谓语、宾语、定语、补语、状语、表语七种
定语就是修饰主语,宾语等成分的词语也可以是句子,那就是定语从句.定语用于描述名词,代词,短语或从句的性质,特征范围等情况的词叫做定语,定语可以由名词,形容词和起名词和形容词作用的词,短语担任.如果定语是单个词,定语放在被修饰词的前面,如果是词组,定语放在被修饰词的后面.
比如说蓝蓝的天.蓝蓝的就是定语.
He is the good man.good就是定语修饰man
he is the man who helped the teacher.who helped the teacher.就是定语从句
宾语一般是介词或者动词后面的词语,句子就是宾语从句.宾语是动作的对象或承受者,常位于及物动词或介词后面.宾语可由名词、代词、数词、名词化的形容词、不定式、动名词、宾语从句等来担任.
比如他是学生.学生就是宾语.
he is a student.a student就是宾语
He said that he would go to Shanghai.that he would go to Shanghai.
就是宾语从句
定语从句是指有先行词的从句
引导词为that which who whom where when as等
根据先行词在从句中充当的成分不同选择引导词疑问代词、疑问副词都是定语从句的引导词.
从句缺少主语,宾语,表语用疑问代词
缺少其他用疑问副词
例句：做宾语we often think of the days____we spent together on the island.
A when
B which
C in which
D during which
选B the days在从句中做宾语 用which
做状语He has left Beijing,____a meeting is to be held.
A when
B where
C as
D which
选B
Beijing 在从句中做地点状语 原句为He has left Beijing.In beijing a meeting is to be held.
做主语His father died last year,____made it impossible for him to go abroad.
A when
B which
C as
D that
选B 从句中made缺少主语,这是非限制性定语从句不能that 所以选which
注意：定语从句中不能用what引导从句
that引导的定语从句充当主语 宾语 表语成分
但是对于非限制性定语从句中,一般是跟在逗号后面的从句不能用that引导
可以选择as which who whom whose 等
宾语从句：及物动词,形容词和介词后加宾语从句作其宾语.
宾语从句时态与主句相呼应,但宾语从句表示的是客观真理或普遍现象除外The teacher told us that the earth moves around the sun.
宾语从句中that不做任何成分.也就是说that所引导的从句本身是完整的
（2）you should do your homework这个句子完整,那就是缺少时间状语,所以用 It was at 5 o'clock when .when修饰时间状语at 5 o'clock.我的理解
（3）当修饰一个地点的从句里,用where还是用that
应该看where|that前面的地点,也就是先行词在从句中什么成分
比如定语从句中地点在从句中做地点状语用where
如果做主语.宾语.表语无疑是用that啦.

1。首先要明白什么是定语，什么是宾语，定语就是修饰名词的成分，叫做定语，宾语则是句子动作的承受者。例如：he is a handsome boy.句中的handsome就是个定语，因为他修饰了boy，这时候如果你觉得handsome还不够形容这个boy，那可以用定语从句了。he is a handsome boy who she likes most。宾语：my teacher taught me...

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1。首先要明白什么是定语，什么是宾语，定语就是修饰名词的成分，叫做定语，宾语则是句子动作的承受者。例如：he is a handsome boy.句中的handsome就是个定语，因为他修饰了boy，这时候如果你觉得handsome还不够形容这个boy，那可以用定语从句了。he is a handsome boy who she likes most。宾语：my teacher taught me well。跟在taught后面的me就是宾语。宾语从句只有在宾语太长不能用一个词或词组表示出来的时候才用。
2。再回答你的问题。在句子中when you should do your homework是定语从句，在定语从句中且修饰的是clock，在后面这句子中做状语，状语只能用关系副词来引导，表示时间的关系副词只有when了。
3。问题三要看情况而定，如果从句修饰的先形词（某名词）从句中做主语或宾语则用that或which，如果在从句中做状语就用where。例如：the garden is a place that(which ) i like most.(place在句子中做宾语）
the garden is a place where i played with my friends 。（place在从句中做状语）
最后更正一下楼上，it is XXthat（who）的强调句型判断很简单，去掉it is 以及that 或who看还是否成立，很明显句子缺少成分了。
补充一下：要判断什么时候用定语从句什么时候用宾语从句很简单，只需要看从句前面的词语是动词还是名词。例如：i think （that）he'll be all right in a few days。（动词的后面，这句是宾语从句） the 2008 Olympic Stadium in Beijing is another design that makes us think about nature.（前面是design，所以是定语从句）

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I have already tried my best to let the quizzer understand. However, It's my failure that I can't make the Questioner know what I said . Therefore,I delete my answer.
祝 学习进步!

①you should do your homework这个句子很完整（不缺主谓宾等），而它缺少时间状语（一般来说状语起补充说明作用，能忽略不考虑），因而用 It was at 5 o'clock when .when修饰时间状语at 5 o'clock.至于楼上的说这句是强调，那去掉it was…… that，原句似乎也成立：you should do your homework at 5 o'...

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①you should do your homework这个句子很完整（不缺主谓宾等），而它缺少时间状语（一般来说状语起补充说明作用，能忽略不考虑），因而用 It was at 5 o'clock when .when修饰时间状语at 5 o'clock.至于楼上的说这句是强调，那去掉it was…… that，原句似乎也成立：you should do your homework at 5 o'clock.但我认为如果是修饰时间状语，还是用when更好的。②在句子中起宾语作用的从句叫做宾语从句（一个句子作动词或介词的宾语），起定语作用的句子是定语从句。
宾语从句用法：一连接词
1．从句为陈述句，常选择连接词that或将that省略，直接与主句相连。 2．从句为一般疑问句，常选择连接词if或whether。在 whether … or not 结构中不能用 if 替换。 3．从句为特殊疑问句，常选择what,when,where,which,who,how等的疑问代、副词作连接词。
二但定语从句中则应要有先行词。如"This novel, which I have read three times, is very touching. 这本小说很动人，我已经读了三遍。"中novel是先行词，后面的句子起修饰限制作用，修饰novel。
三定从中的关系副词关系副词=介词+关系代词 why=for which where=in/ at/ on/ ... which (介词同先行词搭配) when=during/ on/ in/ ... which (介词同先行词搭配) 1. where是关系副词，用来表示地点的定语从句。 2. when引导定语从句表示时间〔注〕值得一提的是，表示时间“time"一词的定语从句只用when引导，有时不用任何关系代词，当然也不用that引导。 By the time you arrived in London, we had stayed there for two weeks.
四宾从中that用在动词之后，一般也能省略。He didn’t tell me when we should meet again.

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定语从句肯定有先行词，比如I like the idea that is come up with by the group.idea是先行词，that是关系代词，在从句中做主语；
It was at 5 o'clock when you should do your homework !为什么这里用when而不用that！
这句话应该是强调句吧，用It was ...that ....

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定语从句肯定有先行词，比如I like the idea that is come up with by the group.idea是先行词，that是关系代词，在从句中做主语；
It was at 5 o'clock when you should do your homework !为什么这里用when而不用that！
这句话应该是强调句吧，用It was ...that ...
修饰地点要看where或which在从句中的作用。比如We will visit the factory where my father works. 和We will visit the factory that/which my father works at. 从句还原是my father works at the factory,但第二句有at,that/which 就是at的宾语，所以也可以是We will visit the factory at which my father works.注意不能说at that.at which 相当于where。when是一样的道理。

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1． That is one of the books that are required for study at school.